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Date: Tue, 6 Jun 2017 13:03:59 +0200
From: Jiri Olsa <jolsa@...hat.com>
To: David Carrillo-Cisneros <davidcc@...gle.com>
Cc: linux-kernel@...r.kernel.org,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Andi Kleen <ak@...ux.intel.com>, Simon Que <sque@...omium.org>,
Wang Nan <wangnan0@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
He Kuang <hekuang@...wei.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
David Ahern <dsa@...ulusnetworks.com>,
Namhyung Kim <namhyung@...nel.org>,
Stephane Eranian <eranian@...gle.com>,
Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH v2 13/13] perf tools: add feature header record to
pipe-mode
On Tue, Jun 06, 2017 at 12:57:53AM +0000, David Carrillo-Cisneros wrote:
> On Thu, May 25, 2017 at 1:09 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> > On Tue, May 23, 2017 at 12:48:53AM -0700, David Carrillo-Cisneros wrote:
> >
> > SNIP
> >
> > > + for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
> > > + if (!feat_ops[feat].has_record) {
> > > + pr_debug("No record header feature for header
> > :%d\n", feat);
> > > + continue;
> > > + }
> > > +
> > > + fdd.offset = sizeof(*fe);
> > > +
> > > + ret = feat_ops[feat].write(&fdd, evlist);
> > > + if (ret || fdd.offset <= (ssize_t)sizeof(*fe)) {
> > > + pr_debug("Error writing feature\n");
> > > + continue;
> > > + }
> > > +
> > > + /* fdd.buf may have changed due to realloc in do_write() */
> > > + fe = fdd.buf;
> > > + memset(fe, 0, sizeof(*fe));
> >
> > no need to wipe it out if you set all the members just below
> > (apart from header.misc, which is not used)
> >
>
> what if that changes one day? isn't it better to zero to avoid hard to find
> bugs?
ok
jirka
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